There's no mistaking the fact indoor air pollution is worse for you to breathe than outdoor air. In fact, some experts estimate indoor air can be up to 10 times dirtier. Since people spend 90 percent of their days and nights inside their homes, cars and various enclosed places, this can be a serious problem. There are, fortunately, effective ways to treat your asthma safely, inexpensively and without the need for a potentially toxic drug. One of the most important things you can do is to balance the ratio of omega-3 fats in your diet by taking a high-quality fish or cod liver oil daily. I wrote an article on this three years ago that was published in one of the major medical journals that goes into great detail on this. I would encourage you to read this useful report. You can also: Retool your diet based on your body's unique nutritional type. This is an enormously powerful tool to help normalize your body's biochemistry. Reduce, with the plan of avoiding, sugar, most grains, fruit juices and pasteurized dairy products. Exercise. Amazingly, this simple and inexpensive recommendation can have profound benefits in the treatment of asthma. A course of allergy skin tests (if you suffer from a more severe form of asthma). Avoid ALL commercial milk products, as they are notorious for making asthma worse. If you consume milk at all only use raw milk products from grass-fed cows, but even then be careful the raw milk is not worsening the asthma. Consider using vitamin E. Additionally, it's important to keep your indoor environment as clean as possible; I would recommend considering an excellent air purifier, which is easy, safe, cost-effective, and leaves behind no dangerous chemical residues (which are often just as bad as the substances you're trying to clean away.)